def get_key(dic, val):
    for key, value in dic.items():
        if val in value:
            return key

def get_cu(area:str):
    d = {
    "中通" : ["福田", "南山", "前海", "蛇口", "罗湖", "深汕"],
    "市工程" : ["宝安", "光明"],
    "中通建" : ["盐田", "坪大"],
    "长讯" : ["龙华", "龙岗"]
    }

    return get_key(d, area)